diff --git a/tests/duplex.cpp b/tests/duplex.cpp
index 1d680b0b..c4eccfb1 100644
--- a/tests/duplex.cpp
+++ b/tests/duplex.cpp
@@ -12,7 +12,7 @@
 #include <iostream>
 #include <cstdlib>
 #include <cstring>
-
+#include <cstdint>
 /*
 typedef int8_t MY_TYPE;
 #define FORMAT RTAUDIO_SINT8
diff --git a/tests/playraw.cpp b/tests/playraw.cpp
index 7f6ccc9b..d32c3660 100644
--- a/tests/playraw.cpp
+++ b/tests/playraw.cpp
@@ -14,6 +14,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <stdio.h>
+#include <cstdint>
 
 /*
 typedef int8_t MY_TYPE;
diff --git a/tests/playsaw.cpp b/tests/playsaw.cpp
index ee61f064..37d21155 100644
--- a/tests/playsaw.cpp
+++ b/tests/playsaw.cpp
@@ -12,6 +12,7 @@
 #include <iostream>
 #include <cstdlib>
 #include <signal.h>
+#include <cstdint>
 
 /*
 typedef int8_t MY_TYPE;
diff --git a/tests/record.cpp b/tests/record.cpp
index 06d398c9..059eb792 100644
--- a/tests/record.cpp
+++ b/tests/record.cpp
@@ -14,7 +14,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <stdio.h>
-
+#include <cstdint>
 /*
 typedef int8_t MY_TYPE;
 #define FORMAT RTAUDIO_SINT8